EnergyWise Entity

An EnergyWise entity is a physical or logical device with EnergyWise enabled, such as a Catalyst switch, a power over Ethernet (PoE) port, or a PoE device.

EnergyWise uses a distributed model to manage energy usage.

•Switches are grouped in an EnergyWise domain and become domain entities. They receive messages from and send them to other domain entities.

•An entity in the EnergyWise domain responds to queries.

•An entity participating in EnergyWise controls the power usage of connected PoE devices, such as an IP phone, an IP camera, or a PoE-enabled device. For example, a Catalyst switch sends a power-off message to an IP phone.

On an EnergyWise-enabled entity

•The entity always participates in EnergyWise.

•PoE ports participate in EnergyWise.

•Non-PoE ports do not participate in EnergyWise.

EnergyWise Domain

An EnergyWise domain can be an EnergyWise network.

The domain is treated as one unit of power management.

Entities have neighbor-to-neighbor relationships with other domain entities.

EnergyWise Network

Single PoE Switch Scenario

Managing the power usage when

•A PoE entity powers on or off the connected entities.

•A PoE entity applies a network policy that powers on and powers off connected entities. The specified times are local times based on the PoE-entity time zone. For example, IP phones are powered on at 7:00 a.m. (0700) local time, and they are powered off at 7:00 p.m. (1900) local time.

This is also known as the recurrence scenario.

Figure 4-2 Single PoE Switch Example

1

Entity managing power usage

3

Entities

2

Domain

EnergyWise Power Level

The EnergyWise power level is for both a PoE port and a switch.

The range is from 0 to 10.

The default power level is 10.

A Catalyst switch does not support level 0.

A PoE port supports level 0 to level 10.

If the power level is 0, the port is powered off.

If the power level is from 1 to 10, the port is powered on. If the power level is 0, enter any value in this range to power on the PoE port or the switch.

When the power level changes, the port determines the action for the connected entities.

EnergyWise Importance

Set the EnergyWise importance value on a PoE port or a switch to rank domain entities.

The range is from 1 to 100.

The default importance value is 1.

EnergyWise Names, Roles, and Keywords

Set an EnergyWise-specific entity name to identify the domain entity.

•For a PoE port, the default is a short version of the port name; for example, Gi0.2 for Gigabit Ethernet 0/2.

•For a switch, the default is the hostname.

Set the role of the domain entity to differentiate it from other entities.

•For a PoE port, the default is interface.

•For a switch, the default is the model number.

Set at least one keyword describing an entity to differentiate it from other entities.

Configuration Guidelines

By default, EnergyWise is disabled.

When you add an entity to a domain, EnergyWise is enabled on the entity and its PoE ports.

Use the energywise level 0 interface configuration command to power off a PoE port.

You cannot use the energywise level 0 global configuration command to power off the entity.

If you schedule the entity to power on the PoE port at 7:00 a.m. (0700), the port powers on within 1 minute, between 7:00 a.m.(0700) and 7:01 a.m. (0701) local time.

PoE and EnergyWise Interactions

Table 4-1 Does the Entity Participate in EnergyWise?

EnergyWise Entity

PoE Mode

auto

never

static

PoE port

Yes

No

Yes

Non-PoE port

No

No

No

If the PoE port mode is never, the port power is off, but EnergyWise is not disabled. You can

•Configure EnergyWise on the port.

•Configure the port power level. The level takes effect after you change the port mode to auto or static. You do not need to restart the switch.

If EnergyWise is disabled, the entity can use PoE to manage port power.